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## Homework Statement

For:

z(x,y)=(x^2)y-3y

Find [tex]\Delta[/tex]z and dz when x=4, y=3, [tex]\Delta[/tex]x=-0.01, [tex]\Delta[/tex]y=0.02

## Homework Equations

## The Attempt at a Solution

I got the partial derivatives:

df/dx=2xy, and df/dy=x^2-3

and solved dz=0.02

However, I don't know how to find [tex]\Delta[/tex]z